Question

Which side lengths do not make a triangle ?

10, 15, 23
1, 2, 4
5, 6, 7
6, 8, 9

Answer 1

1,2,4

Explanation:

Okay so basically in a triangle, the sum of any two sides should be greater than the third remaining side. So if we had a triangle with sides A, B, and C, A+B>c, A+C>B, and B+C>A. If you look at 1,2, and 4, 1=2=3 which is less than 4. That is why that is not a triangle.